/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.scheduling.commonj;

import commonj.work.Work;

import org.springframework.scheduling.SchedulingAwareRunnable;
import org.springframework.util.Assert;

/**
 * Simple Work adapter that delegates to a given Runnable.
 *
 * @author Juergen Hoeller
 * @see commonj.work.Work
 * @see java.lang.Runnable
 * @since 2.0
 */
public class DelegatingWork implements Work {

    private final Runnable delegate;


    /**
     * Create a new DelegatingWork.
     *
     * @param delegate the Runnable implementation to delegate to
     * (may be a SchedulingAwareRunnable for extended support)
     * @see org.springframework.scheduling.SchedulingAwareRunnable
     * @see #isDaemon()
     */
    public DelegatingWork(Runnable delegate) {
        Assert.notNull(delegate, "Delegate must not be null");
        this.delegate = delegate;
    }

    /**
     * Return the wrapped Runnable implementation.
     */
    public final Runnable getDelegate() {
        return this.delegate;
    }


    /**
     * Delegates execution to the underlying Runnable.
     */
    @Override
    public void run() {
        this.delegate.run();
    }

    /**
     * This implementation delegates to
     * {@link org.springframework.scheduling.SchedulingAwareRunnable#isLongLived()},
     * if available.
     */
    @Override
    public boolean isDaemon() {
        return (this.delegate instanceof SchedulingAwareRunnable &&
                ((SchedulingAwareRunnable) this.delegate).isLongLived());
    }

    /**
     * This implementation is empty, since we expect the Runnable
     * to terminate based on some specific shutdown signal.
     */
    @Override
    public void release() {
    }

}
